Re: question about reg. expression

Another way to match multiple occurrences is to use curly brackets with a
number, like:
select 'ab' ~ '^[a-z]{2}$';

It can be done with a range of numbers as well:
select 'ab' ~ '^[a-z]{2,4}$';
select 'abab' ~ '^[a-z]{2,4}$';

I believe, however, that the curly brackets notation was introduced in 9.0
and is not available in earlier versions.

--Stephen

On Wed, Jan 19, 2011 at 5:21 AM, Samuel Gendler
<sgendler(at)ideasculptor(dot)com>wrote:

> I'd think you need to indicate multiple alphabetic matches. Your first
> regex actually matches only b followed by end of string and the second is
> really only matching start of string followed by a. The third is looking
> for a single character string.
>
> Try this: select 'ab' ~ '^[a-z]+$'
> or this: select 'ab' ~ '^[a-z]*$'
>
> or if looking only for 2 character strings: select 'ab' ~ '^[a-z][a-z]$'
>
>
> On Tue, Jan 18, 2011 at 3:41 PM, andrew1 <andrew1(at)mytrashmail(dot)com> wrote:
>
>> hi all,
>>
>> these return t:
>> select 'ab' ~ '[a-z]$'
>> select 'ab' ~ '^[a-z]'
>>
>> select 'ab' ~ '^[a-z]$' returns f
>>
>> Can't I use ^ and $ at the same time to match, in this case?
>> thanks.
>>
>> --
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>
>